ANALYSIS OF TEMPERATURE CHARACTERISTIC OF SYSTOLE IN HIBERNATOR WITH ULTRASONIC TOMOGRAPHY

在本研究中，我用B-模式和m -模式的超声断层扫描检查了8ºC低温下冬眠动物（叙利亚仓鼠）的温度特征。并将其与非冬眠动物（Wistar大鼠）作为对照组的实验结果进行了比较。非冬眠者在腹部温度（Tab）为19ºC时出现完全房室传导阻滞，而冬眠者在10ºC时出现P-Q间期延长的第一阶段房室传导阻滞。非冬眠者Tab值为18.11 <±> 0.83，然后ECG消失。而在冬眠期，Tab <±> 0.31 C均未出现下降现象。心梗超声扫描显示，非冬眠者左室心肌运动在低于21.8 h / o / C时变得缓慢。二尖瓣速度缓慢，提示心排血量下降。另一方面，9.8 C在hibernator中也发现了类似的发展。在非冬眠状态下，冬眠者在低温下仍能维持心功能，具有明显的耐寒性，与冬眠状态一样。

In this study, I examined temperature characteristic of cardiac function with ultrasonic tomograph by B- and M-modes under a course of hypothermia at 8ﾟC caused by acute cold exposure hibernator (Syrian hamster). I compared it with experimental findings of non-hibernator (Wistar rat) as control group.In electrocardiography (ECG), complete atrioventricular block was observed at abdominal temperature (Tab) of 19ﾟC with non-hibernator, but atrio-ventricular block of the first stage that P-Q interval got longer at 10ﾟC was recognized in hibernator. Furthermore, Tab was 18.11 <plus-minus> 0.83ﾟC in non-hibernator, then ECG disappeared. But the phenomenon wasn't observed to depressed Tab of 7.22 <plus-minus> 0.31ﾟC in hibernator. Movement of myocardium of left ventricle became slow when became less than 21.8ﾟC with non-hibernator in ultrasonic tomography of heart stroke. Speed of mitral valve also observed slowly, so degradation of cardiac output was suggested. On the other hand, similar development was found by 9.8ﾟC in hibernator. As examination subject after now, it couldn't measure a clear ultrasonic tomography by shivering of cold exposure early stIn non-hibernation, cardiac function of hibernator was maintained under hypothermia, the significant cold tolerance was provided as well as in hibernation.